Lightroom: Scroll bar not visible in the Book Module

When trying to select a page layout in the book module of Lightroom, the pop-up menu to select the new layout is visible but the scroll bar is not. All of my Adobe apps are up to date. I am running Windows 7 Home Premium with SP1 installed; I have also installed all recent updates for the OS.

A LR 6.1.1/2015.1.1 update was released a couple days ago. Are you running that version, yet, in case it's been fixed?

Otherwise, you can use the mouse-wheel to scroll that layout list, or there is actually a scrollbar on the right that happens to be the same color as the background so it is possible to scroll using it if you can guess where it is and click drag on it.

Lightroom 6 jan 2016 update has still not fixed problem in book module where the scrollbar does not highlight when trying to change page layout. Scroll bar although present is actually invisible and has no white highlight. Also why was Dehaze not included in update for LR6.4